The aim of the prospective project is to investigate effect of daily probiotic supplements on dental caries development in preschool children living in a low socioeconomic immigrant area in souithern Sweden. The study design is a randomised controlled trial with two parallell arms. The intervention is one probiotic tablet or placebo once daily. The null hypothesis is that the caries experience and increment will not differ betwwen the two groups.

Children that are uncooperative or totally reject dental examination are excluded

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Please refer to this study by its ClinicalTrials.gov identifier: NCT01720771